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15th June 2009, 02:10 PM
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#1 |
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diyAudio Member
Join Date: Sep 2004
Location: Madrid
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Does this power supply make any sense to you?
I like checking what the manufacturers are doing today, especially the Japanese. Well there is this EL84 PP amp and i start looking at the power supply and i donīt understand what this diode is doing there. See picture:
What kind of rectifier is this? Half wave? |
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15th June 2009, 02:47 PM
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#3 |
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diyAudio Member
Join Date: Jun 2004
Location: Pittsburgh, crumbling wasteland
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15th June 2009, 04:25 PM
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#6 |
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diyAudio Member
Join Date: Aug 2006
Location: Taxland, New Jersey
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Sawreyrw is correct. As drawn, it's a recipe for disaster. The diode across the secondary will short the transformer out and burn it up. For a voltage doubler, there must be a second capacitor in series with the first (shunting) diode. If you drew this from the existing amp, please recheck it again.
__________________
"The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University |
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15th June 2009, 04:25 PM
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#7 |
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diyAudio Member
Join Date: Sep 2004
Location: Madrid
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It is difficult to reverse engineer this power supply, it makes no sense!
It has to be a half wave voltage doubler, see a better pic. http://www.audioasylum.com/cgi/t.mpl?f=tubediy&m=152516 |
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15th June 2009, 04:38 PM
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#8 |
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diyAudio Member
Join Date: Sep 2004
Location: Madrid
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You can see that those diodes go to the same point and one ends in ground. Maybe is a half wave with 2 diodes in series but one is grounded so it cannot be,maybe it is just my mistake following those wires, and all this just out of curiosity....i know the amp sounds great.
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15th June 2009, 07:28 PM
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#9 | |
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diyAudio Member
Join Date: Jan 2008
Location: Bridgeville, CA
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Quote:
It all makes sense if one assumes that the black wires cross under the terminal strip as shown here in blue. That makes it a regular voltage doubler. I think of a voltage doubler as neither half wave or full wave. It's more like two half wave rectifiers on opposite AC half-cycles, in series. Cheers, Michael |
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15th June 2009, 07:31 PM
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#10 |
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diyAudio Member
Join Date: Jan 2008
Location: Bridgeville, CA
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It would be according to this schematic:
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